Charybdotoxin (ChTX) is a Ca2+-activated K+ channel blocker. It depolarizes peripheral T lymphocytes and blocks their mitogen-induced proliferation. ChTX is a highly basic peptide isolated from venom of the scorpion, Leiurus quinquestriatus hebraeus.
Ref: Leonard, R. et al. Proc. Natl. Acad. Sci. USA 89, 10094 (1992); Gimenez-Gallego, Proc. Natl. Acad. Sci. USA 85, 3329 (1988). Sugg, E. et al. J. Biol. Chem. 265, 18745 (1990).
Molecular Weight
4296
Sequence (One-Letter Code)
Pyr-FTNVSCTTSKECWSVCQRLHNTSRGKCMNKKCRCYS (Disulfide bridge: 7-28, 13-33 and 17-35)
Sequence (Three-Letter Code)
Pyr - Phe - Thr - Asn - Val - Ser - Cys - Thr - Thr - Ser - Lys - Glu - Cys - Trp - Ser - Val - Cys - Gln - Arg - Leu - His - Asn - Thr - Ser - Arg - Gly - Lys - Cys - Met - Asn - Lys - Lys - Cys - Arg - Cys - Tyr - Ser - OH (Disulfide bridge: 7 - 28, 13 - 33 and 17 - 35)